American Dictionary
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to crush something such as paper or cloth so that it forms messy folds, or to be crushed in this way
I quickly crumpled up the letter and shoved it in my pocket.
The front section of the car had crumpled in the collision.
to fall to the ground suddenly, with your body, legs, and arms bent, because you are injured, sick, or upset
He crumpled in a heap at our feet.
if your face crumples, you suddenly look very unhappy or disappointed